linux-kernel - Re: [RFC V4 0/6] blk: make blk-rq-qos policies pluggable and modular

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Message-ID: <Yg4Kl6EHWS5N3WoH@infradead.org>
Date:   Thu, 17 Feb 2022 00:43:03 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "Wang Jianchao (Kuaishou)" <jianchao.wan9@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Josef Bacik <jbacik@...com>,
        Tejun Heo <tj@...nel.org>,
        Bart Van Assche <bvanassche@....org>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC V4 0/6] blk: make blk-rq-qos policies pluggable and modular

On Thu, Feb 17, 2022 at 11:13:43AM +0800, Wang Jianchao (Kuaishou) wrote:
> Hi Jens
> 
> blk-rq-qos is a standalone framework out of io-sched and can be used to
> control or observe the IO progress in block-layer with hooks. blk-rq-qos
> is a great design but right now, it is totally fixed and built-in and shut
> out peoples who want to use it with external module.

And that's got.  External modules do not matter.

That being said this series has a bunch of nice cleanups, but we really
do not need the exports and modular build.